Dishwasher, spray device for a dishwasher and method for operating a dishwasher

Abstract

Dishwasher (1), with - a rinsing chamber (3) for holding wash ware, - a spray device (6) for distributing rinsing water in the rinsing chamber (3), wherein the spray device (6) comprises a spray propeller (8) rotatably mounted about a rotation axis (7), - an electric motor drive (14) for rotating the spray propeller (8), - a pumping device for discharging the rinsing water, and - a heating device for heating the rinsing water, -- wherein the electric motor drive (14) is designed to drive the spray propeller (8) at variable speeds and / or with alternating directions of rotation, -- wherein the spray propeller (8) is designed as a single-armed device with respect to the rotation axis (7), -- wherein the rinsing chamber (3) is divided into different spray zones (16, 17, 18, 19) over a full revolution of the spray propeller (8) and / or can be subdivided according to user requirements, -- wherein each of the spray zones (16, 17, 18, 19) is assigned a function type and / or can be assigned to a specific user, and -- wherein the electric motor drive (14) is designed to drive the spray propeller (8) in each spray zone (16, 17, 18, 19) during operation of the dishwasher (1) at a speed associated with the type of function of the respective spray zone (16, 17, 18, 19), characterized in that the pump device is designed to dispense the rinse water at a rinse water pressure with a varying pressure value via nozzle openings (12) arranged in a spray arm (10) of the spray propeller (8) and / or that the heating device is designed to heat the rinse water to a rinse water temperature with a varying temperature value, wherein the electric motor drive (14) and / or the pump device are designed to dispense the rinse water by means of the spray propeller (8) only in one of the total number of spray zones (16, 17, 18,19) reduced part of the spray zones (16,17,18,19).

Description

[0001] The invention relates to a dishwasher. Furthermore, the invention relates to a spray device for a dishwasher. Furthermore, the invention relates to a method for operating a dishwasher.

[0002] Dishwashers are used primarily for cleaning wash ware, which can be divided into crockery (usually porcelain plates, cups, etc.), cutlery (knives, forks, spoons, etc.), and cookware (pots, pans, and the like). For this purpose, dishwashers usually comprise a substantially cuboid-shaped wash chamber that can be closed by a door. Wire mesh supports, usually referred to as dish or cutlery baskets, are arranged in the wash chamber for the wash ware. These supports can be pulled out of the wash chamber in increments for loading and unloading. In order to apply wash water, which is mixed with a cleaning agent (detergent) at least in one wash cycle and is also referred to as "wash liquor," to the wash ware during (washing) operation of the dishwasher, dishwashers usually have spray devices with one or more spray propellers (similar to an aircraft propeller).These usually have several nozzle openings through which the rinse water directed inside the respective spray propeller is directed outward toward the dishes. Often, several angled nozzle openings (hereinafter referred to as drive nozzles) serve to (hydraulicly) drive the respective spray propeller. During operation of the dishwasher, these spray propellers rotate and spray rinse water onto the dishes from above or below.

[0003] However, the rinse water emerging from such drive nozzles often only hits the washware at a shallow angle and may not fully wet it, especially when the washware is large, such as pots or large plates. This can lead to unsatisfactory cleaning results in areas swept by such drive nozzles, especially with heavily soiled washware. Dishwashers are known, among others, from DE 10 2007 038 673 B3 and WO 2013 / 132458 A1.

[0004] The invention is based on the object of providing an improved dishwasher.

[0005] This object is achieved according to the invention by a dishwasher having the features of claim 1. Furthermore, this object is achieved according to the invention by a method for operating a dishwasher having the features of claim 6. Advantageous and partly inventive embodiments and further developments of the invention are set out in the subclaims and the following description.

[0006] The dishwasher according to the invention (hereinafter referred to as dishwasher) comprises a preferably substantially (i.e., approximately) cuboid-shaped washing chamber for receiving wash ware and a spray device for distributing wash water in the washing chamber and preferably over the wash ware arranged in the washing chamber, particularly during operation of the dishwasher. The spray device further comprises a spray propeller mounted so as to be rotatable about a rotational axis. This spray propeller is designed as one-armed with respect to the rotational axis. In addition, the dishwasher comprises an electric motor drive for rotating the spray propeller about the rotational axis. The electric motor drive is designed to drive the spray propeller at variable speeds (i.e., at a variable rotational speed) and / or with alternating rotational directions.

[0007] A "single-armed" spray propeller is understood here and below to mean that the spray propeller is asymmetrical and has only (i.e. exactly) one spray arm (also referred to as a propeller blade) protruding from the axis of rotation. The spray arm is essentially radial (ray-like or spoke-like) to the axis of rotation. "Essentially radial" means here and below that the spray arm can deviate slightly from a (straight-line) radial jet, for example by the spray arm being slightly curved along a radial plane. The spray arm preferably has a plurality of nozzle openings on one side - which is directed towards the washware during normal operation of the dishwasher - for discharging the wash water onto the washware.

[0008] The rinsing chamber is divided over one full revolution of the spray propeller, i.e. in particular the propeller plane, into various, preferably sector-like parts or areas or can be subdivided on a user-specific basis (in particular by means of an input device assigned to the control unit). These areas of the propeller plane are referred to below as spray zones. Preferably, the propeller plane is divided into at least two spray zones. However, the propeller plane is particularly preferably divided into four, approximately quarter-circle-shaped spray zones. Each of the spray zones is preferably assigned a function type (also: operating mode) - in a first case - or - in a second case - can be assigned to a user-specific basis (in particular by means of the input device).

[0009] The dishwasher comprises a pump device which is designed to discharge the rinse water at a rinse water pressure with a varying pressure value via the nozzle openings arranged in the spray arm. The respective pressure value is preferably dependent on the function type assigned to the respective spray zone in which the spray arm of the spray propeller is currently located. In particular, the pressure value for the respective function type is predetermined on the control side (i.e. preferably in the control unit described above). For example, for the function type "care" a comparatively low pressure value is predetermined (stored) in the control unit of the dishwasher, so that the dishes arranged in the corresponding spray zone ("care zone") are advantageously exposed to only low mechanical forces.For the "intensive" function, a comparatively high (especially the highest) pressure value is preferably stored accordingly, so that the best possible cleaning result is achieved. By varying the rinse water pressure (pressure value), the amount of rinse water applied can advantageously be varied - if necessary in addition to varying the speed and / or direction of rotation of the spray propeller - and thus savings can be achieved in spray zones with low rinse water requirements.

[0010] The dishwasher comprises a heating device for heating the wash water to a wash water temperature, the temperature value of which preferably varies over the course of a wash program. This means that the temperature value of the wash water temperature rises, falls or fluctuates during the course of a wash program, in particular a program section, depending on a (temperature) curve predetermined by the control system (i.e. preferably in the control unit described above). This makes it possible, for example, to adapt the cleaning effect of the dispensed wash water to varying degrees of contamination on the washware. In particular, in the event that specific contaminants only require the action of comparatively warm wash water for a short time in order to be removed from the washware, energy for heating can be saved.

[0011] The electric motor drive and / or the pumping device are designed, in particular within a program section, to dispense the rinsing water by means of the spray propeller only in a smaller proportion of the spray zones compared to the total number of spray zones, starting from a predetermined or user-specific adjustable threshold value for the rinsing water temperature. In particular, when the dishwasher is in operation, starting from this threshold value - i.e. preferably when the rinsing water has a comparatively high temperature - the rinsing water is only dispensed in the "intensive zone". For this purpose, the spray propeller is pivoted in a constantly changing direction of rotation, in particular only within this "intensive zone" (or the several spray zones selected as an "intensive zone"), or the pumping device only dispenses the rinsing water cyclically when the spray propeller (which continues to rotate in a circle) is within the "intensive zone".For example, during a program section, the rinse water is continuously heated and distributed over the washware—possibly by varying the speed of the spray arm. If the threshold is exceeded, the appropriately heated rinse water is then only applied within the intensive zone. This provides a simple and effective way to prevent temperature-sensitive washware (e.g., plastic items) located in the other spray zones from being directly exposed to "too warm" rinse water.

[0012] The term “variable” speed is understood here and below to mean that the respective speed of the spray propeller is preferably specified differently over the duration of a wash cycle, preferably depending on a wash program, in particular on a program section of such a wash program. Such a wash program is preferably stored in a control unit assigned to the dishwasher and is processed by this during a wash cycle. This control unit is expediently set up to control the operation of the dishwasher, in particular to control the electric motor drive of the spray propeller. In a wash program, in particular a temporal sequence (preferably the duration) of various program sections (cycles or “phases”) - e.g.a main cleaning cycle, one or more (intermediate) rinse cycles, and a drying cycle—as well as various operating settings assigned to the respective program sections, such as different speeds for the spray propeller. Preferably, several wash programs are stored in the control unit, one of which can be selected (user-specifically) by a dishwasher user before the start of a wash cycle, particularly depending on the type and quantity of washware and, for example, its degree of soiling.

[0013] The advantage of the single-arm spray propeller is that rinse water is only applied to the wash ware in the area currently covered by one spray arm - i.e. only in a (circular) sector covered by the spray arm of a radial plane swept by one full rotation of the spray arm around the rotation axis (hereinafter: propeller plane). This, in conjunction with the variable speed and / or the changing direction of rotation, allows more or less rinse water to be applied in a targeted manner within a sector-like part of the propeller plane compared to the rest of the propeller plane. The use of rinse water can therefore be easily reduced to the part of the propeller plane swept by one spray arm, thus reducing (total) rinse water consumption.Furthermore, due to the electric motor drive, each nozzle opening arranged on the spray arm can advantageously be designed (and used) for the targeted and, in particular, largest-area spraying of the washware with rinse water, since nozzle openings for the hydraulic drive of the spray propeller can be omitted.

[0014] The single-arm spray propeller is preferably arranged at the bottom of the washing chamber and thus in particular below a crockery basket which is expediently designed to accommodate large and often comparatively heavily soiled items of dishware - e.g. pots, pans, plates, soup bowls and the like.

[0015] In the first case, the function types are specifically assigned to the spray zones, so that the dishwasher user must place the dishes into the dish basket (located above the single-arm spray propeller) according to their degree of soiling. In this first case, the respective spray zones on the dish basket are preferably color-coded, i.e., clearly distinguishable from one another.

[0016] In the second case, the control unit is configured, in particular by means of the input device (for example a switch panel or a touch panel), to assign the respective function type to the preferably four spray zones upon user input. For example, a basic setting regarding the assignment of the function types is predefined, which the user can change using the input device before starting the washing program, in particular depending on the individual load of the dish basket. In this second case, too, a colored or other type of marking of the spray zones is preferably arranged on the corresponding dish basket so that the user can expediently recognize the boundaries of the individual spray zones and observe them when loading the dishware.

[0017] In a suitable further development, the electric motor drive is designed to drive the spray propeller in each spray zone during operation of the dishwasher at a speed assigned to the type of function of the respective spray zone (preferably preset in the control unit depending on the program).

[0018] Here and in the following, “function type” or “operating mode” is preferably understood to mean a setting within a dishwashing program, in particular within a program section, which is directed, for example, at the amount of dishwashing water to be dispensed in the respective spray zone and / or the addition of detergent to the dishwashing water. This setting expediently depends on the type of dishware and / or the degree of soiling (large amounts of dried-on food residue, etc.). Preferably, at least two, but in particular three, function types are stored in the dishwasher, in particular in the control unit, for assignment to the dishwashing zones. A function type referred to as “intensive” is used in particular for cleaning heavily soiled dishes.For this function type, it is expedient to apply a larger amount of rinse water to the dishes arranged in the corresponding spray zone than for a (second) function type designated as "normal", which is designated for an average degree of soiling of the dishes. Preferably, the third function type is a function type designated as "soft", "care" or "sensitive", which is intended in particular for delicate dishes, e.g. dishes made of particularly thin-walled porcelain, high-quality glass or the like. In the latter case, for example, the control unit is configured to apply the rinse water in the corresponding spray zone in such a way that the dishes arranged there are not moved by the rinse water and therefore do not knock against each other.For this purpose, it is conceivable within the scope of the invention that the spray propeller is moved through this spray zone at a particularly high speed, so that there is only a short contact time between a jet of rinse water and a piece of crockery.

[0019] In the event that the function types are permanently assigned to the spray zones and the latter are color-coded on the corresponding dish basket, for example, the color “red” is intended for the spray zone of the function type “intensive”, “grey” for “normal” and “blue” for “care”.

[0020] The above-described division of the propeller plane into spray zones, as well as the (function-dependent) variation of the speed of the single-arm spray propeller in the respective spray zone, enable a particularly precise distribution of rinse water to the washware, depending on the type of washware and the respective degree of contamination. This can advantageously improve the cleaning result and also reduce rinse water consumption.

[0021] In a further expedient embodiment, additional to or alternative to the speed variation described above, the electric motor drive is particularly configured to drive the spray propeller with a changing direction of rotation in at least one of the spray zones during operation of the dishwasher, depending on the function type assigned to that spray zone. Thus, in particular, in the spray zone assigned the "intensive" function type (this spray zone is also referred to as the "intensive zone"), the direction of rotation is changed several times, so that the spray propeller sweeps over it more frequently than the other spray zones, thus delivering a correspondingly larger amount of rinse water. In other words, the spray propeller oscillates back and forth several times in the intensive zone, whereas other spray zones (e.g., a "normal zone" or a "care zone") are swept over less frequently or only once.This also leads to an improvement in the cleaning effect and to the saving of rinsing water in spray zones with lower water requirements.

[0022] In order to be able to apply rinse water to the washware arranged in corner areas of the wash chamber even in those corners, an advantageous embodiment provides for a pivotable extension provided with nozzle openings at a free end of the spray propeller (in particular its spray arm) remote from the axis of rotation. It is recognized that the corner areas of the (cuboid) wash chamber cannot be sprayed with rinse water, or can only be sprayed insufficiently, using a conventional spray propeller, which usually sweeps over a circular disk. The extension is particularly pivoted to the free end of the spray arm of the spray propeller in such a way that the extension pivots out as an extension of the spray arm when the latter is located in the corner areas of the wash chamber and pivots back (at an angle) towards the spray arm when the latter moves along the side walls of the wash chamber.

[0023] In a practical development, the rinsing chamber has (particularly on the inside of its side walls) a (rail-like) guide bar for guiding the extension during pivoting out and in relative to the spray arm. The extension of the spray propeller is guided by the guide bar, particularly as the spray propeller passes through the corner areas, in such a way that the extension can pivot outward as a kind of extension to the spray arm. Preferably, the extension has an attachment for sliding guidance on the guide bar or a rolling element—e.g., a wheel or a ball—for rolling guidance on the guide bar.

[0024] In order to be able to determine the current (rotational) position of the spray propeller, in particular its spray arm, in relation to the wash chamber and thus to control it precisely, particularly with regard to the spray zones, the dishwasher, in a practical embodiment, has a sensor device for position determination. This sensor device is preferably arranged on a wall (side wall or floor) of the wash chamber so that the rotational position of the spray propeller relative to the wash chamber can be determined. The sensor of the sensor device can be, for example, a Hall sensor, an optical sensor (e.g., a type of light barrier), an ultrasonic sensor, or the like. The arrangement of the sensor device in the wash chamber advantageously enables simplified installation of the spray device, since the electric motor drive, in particular, does not need to be precisely aligned with the rotational position relative to the wash chamber during installation.

[0025] The method according to the invention is used to operate the dishwasher described above. According to the method, the single-arm spray propeller for discharging the rinse water is driven at variable speeds and / or with alternating rotational directions.

[0026] In a preferred embodiment of the method, the rinsing chamber is divided into the various spray zones in the direction of rotation of the spray propeller (i.e., in the propeller plane), wherein the division is predetermined, in particular, by the user or by the factory (i.e., in particular, by the program). Furthermore, each of the spray zones is assigned one of the functional types described above (again, user-specific or program-dependent). Furthermore, the single-arm spray propeller in each spray zone is driven at the speed assigned to the functional type of the respective spray zone and / or with varying frequency of rotational direction changes.

[0027] In a further preferred embodiment of the method, the rinse water is heated continuously, in particular within a program section, and from a predetermined threshold value for the rinse water temperature onwards, it is only sprayed in the proportion of spray zones which is smaller than the total number of spray zones. The rinse water is expediently heated to a target temperature value during the corresponding program section. This is predetermined in particular depending on the degree of soiling and / or the type of soiling. Within the scope of the invention, it is also conceivable for this target temperature value to be significantly - e.g. 10 to 30 degrees Celsius - above the threshold value. In other words, in the latter case, the rinse water continues to be heated even after the threshold value has been exceeded.

[0028] Further embodiments of the method according to the invention emerge from the above description.

[0029] Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. In the drawings: Fig. 1 shows a schematic representation of a dishwasher with a view of a front side, Fig. 2 in schematic sectional view II-II according to Fig. 1 a washing chamber of the dishwasher with a division into spray zones, and Fig. 3-5 show a detailed view of an embodiment of a spray propeller of the dishwasher.

[0030] Corresponding parts are always provided with the same reference symbols in all figures.

[0031] In Fig. 1 shows a dishwasher (short: dishwasher 1). The dishwasher 1 comprises a housing 2 enclosing a washing chamber 3. Furthermore, the dishwasher 1 comprises several (here specifically two) dish baskets 4, which serve to hold washware—i.e., crockery, cutlery, etc.—and which can be pulled out (reversibly) from the washing chamber 3 via guide elements 5 in a drawer-like manner for loading and unloading the washware. For (tightly) closing the washing chamber 3, the dishwasher 1 also comprises a dishwasher door (not shown in detail).

[0032] To clean the dishes, dishwashing water is sprayed onto the dishes during operation of the dishwasher 1. For this purpose, the dishwasher 1 comprises a spray device 6, which has two spray propellers (hereinafter referred to as lower spray propeller 8 and upper spray propeller 9), each arranged below one of the two dish baskets 4 and mounted so as to rotate about a rotation axis 7. To supply the dishwashing water to the respective spray propellers 8 and 9, the dishwasher 1 or the spray device 6 comprises guide channels (not shown in detail). The lower spray propeller 8 is specifically designed with one arm and thus has only one spray arm 10, which is essentially radial - i.e. exactly or with slight deviation, e.g. slightly curved as in Fig. 3 - protrudes from the rotation axis 7. The upper spray propeller 9, on the other hand, is rotationally symmetrical with respect to the rotation axis 7 and has two similar spray arms 11, which also protrude substantially radially from the rotation axis 7.

[0033] To apply the rinsing water to the items to be washed, several nozzle openings (also referred to as spray nozzles 12, see Fig. 3 to 5), through which the rinse water, which is directed within the respective spray arms 10 or 11 to the spray nozzles 12, emerges in the direction of the washware. The spray nozzles 12 arranged on the spray arm 10 are all designed with a spray direction pointing towards the washware (which, during operation, is arranged in the lower dish basket 4). On the spray arms 11 of the upper spray propeller 9, some of the spray nozzles 12 are designed as drive nozzles. The spray direction of these drive nozzles does not point towards the washware but is aligned against a predetermined direction of rotation of the upper spray propeller 9, so that the latter is set in rotation by these drive nozzles when rinse water emerges. The lower spray propeller 8, on the other hand, is connected to an electric motor drive 14 (cf. Fig. 3 to 5), by means of which the spray arm 10 of the spray propeller 8 is set in rotation about the rotation axis 7 during operation of the dishwasher 1.

[0034] The dishwasher 1 further comprises a control unit (not shown in detail), which is configured to control the electric motor drive 14 such that, during operation of the dishwasher 1, the lower spray propeller 8 can be operated at different speeds and in alternating directions of rotation. Furthermore, the dishwasher 1 comprises a pumping device (likewise not shown in detail), which is configured - upon appropriate control by the control unit - to pump the wash water into the spray propeller 8 at varying pressure, i.e., with varying pressure values. In addition, the dishwasher 1 comprises a heating device (not shown in detail), which also heats the wash water to different temperatures upon appropriate control by the control unit.

[0035] As from Fig. 2, the rinsing chamber 3 is divided into four quarters (demarcated by dash-dotted lines and the spray arm 10 in its illustrated position) in a propeller plane 15, ie in a plane swept over by the spray propeller 8 and radial to the rotation axis 7, which are circumferentially designated as the first spray zone 16, second spray zone 17, third spray zone 18 and fourth spray zone 19.

[0036] The control unit is configured to assign a function type to each of the spray zones 16 to 19 - in response to an input from a user of the dishwasher 1 at an input device of the control unit. The user can choose from three function types, each of which specifies settings for the spray device 6 (specifically the electric motor drive 14), the pump device, and the heating device. These settings are stored in the control unit. For a function type "care", which is intended for delicate or slightly soiled washware, it is stored that only a small amount of rinse water is dispensed at low (rinse water) pressure (i.e., a low pressure value) and at a low temperature. For a function type "normal", which is intended for averagely soiled washware, correspondingly increased, average settings are stored compared to the function type "care".For an "intensive" function type, which is intended for heavily soiled dishes, a high rinse water volume, high rinse water pressure, and an elevated temperature value are stored. The user can thus sort different items to be washed - depending on their type and level of soiling - into one of the spray zones 16 to 19 and then assign a corresponding function type to the respective spray zone 16 to 19. For example, spray zones 18 and 19, located at the "back" of wash chamber 3, are loaded with pots and heavily soiled dishes, while spray zone 16 is loaded with delicate porcelain and spray zone 17 with cutlery. Accordingly, spray zones 18 and 19 are assigned (by the user) the "intensive" function type, spray zone 16 the "care" function type, and spray zone 17 the "normal" function type.

[0037] The control unit is configured to carry out a process during operation of the dishwasher 1 which is stored in a wash program comprising several program sections. In a program section referred to as the main cleaning cycle, the control unit controls the electric motor drive 14 (following the above example) in such a way that the spray arm 10 is moved at a low speed, i.e. slowly, through the spray zones 18 and 19, which are assigned the "intensive" function type, with the pump device subjecting the wash water to a comparatively high pressure. In the spray zones 16 and 17, the spray arm 10 is moved at a higher rotational speed, and the wash water is subjected to a correspondingly lower pressure. Optionally, the spray arm 10 can also be operated in the spray zones 18 and 19 with alternating directions of rotation (i.e."oscillating", indicated by the double arrow 20) in order to apply even more rinse water compared to the spray zones 16 and 17.

[0038] In a further example of the method described above, the rinse water temperature (i.e., its temperature value) is continuously increased during the main cleaning cycle (or alternatively, in another program section). From a predetermined rinse water temperature threshold, the spray arm 10 is only moved in the spray zone assigned to the "intensive" function type—in this example, in spray zones 18 and 19. This prevents temperature-sensitive items from being directly sprayed with excessively warm rinse water.

[0039] In order to always be able to determine the rotational position of the spray arm 10 in the washing chamber 3 and thus to enable a precise movement of the spray arm 10 through or in the individual spray zones 16 to 19, the dishwasher 1 comprises a sensor system (not shown in detail) for detecting the position of the spray arm 10.

[0040] Because the lower spray propeller 8 is designed as a single arm, a flexible assignment of the function types to the individual spray zones 16 to 19 is possible without having to apply rinse water with the same settings in a diametrically opposite spray zone.

[0041] In Fig. 4 shows a further embodiment of the lower spray propeller 8. In this case, the spray propeller 8 has an extension 24, which also carries spray nozzles 12, at an end remote from the rotation axis 7 (referred to as the free end 22). This extension 24 is pivotally connected to the free end 22. In addition, the extension 24 is spring-loaded relative to the spray arm 10, so that the extension 24 tends to pivot into a position aligned with the spray arm 10. The extension 24 is guided on a guide web 26, which is arranged on the inside of the rinsing chamber 3. This ensures that the extension 24 can be guided in corner regions 28 of the rinsing chamber 3 (cf. Fig. 2) that are not swept over by the spray arm 10, and after passing through the respective corner area 28, swings in again due to the contact with the guide web 26. Thus, the items to be washed arranged in the corner areas 28 are also sufficiently sprayed with rinse water.

[0042] In Fig. Figure 5 shows another embodiment of the lower spray propeller 8. The spray propeller 8 has a propeller-like attachment (referred to as subpropeller 30), which also carries spray nozzles 12. This subpropeller 30 is set in rotation during operation by the appropriate alignment of some of its spray nozzles 12 and the discharge of rinse water (hydraulically) onto the free end 22 of the spray arm 10. The subpropeller 30 serves, on the one hand, to further increase the rinse water quantity in the end region of the spray arm 10 and, on the other hand, to improve the rinse water distribution in the corner regions 28.

[0043] The subject matter of the invention is not limited to the exemplary embodiments described above. Rather, further embodiments of the invention can be derived by those skilled in the art from the above description. In particular, the individual features of the invention and their design variants described with reference to the various exemplary embodiments can also be combined with one another in other ways. List of reference symbols 1 dishwasher 2 housings 3 rinsing chamber 4 dish baskets 5 Guide element 6 Spray device 7 Rotation axis 8 spray propellers 9 spray propellers 10 spray arm 11 Spray arm 12 spray nozzle 14 electric motor drive 15 Propeller level 16 spray zones 17 Spray zone 18 spray zone 19 Spray zone 20 double arrow 22 free people 24 Extension 26 Guide bridge 28 Corner area 30 subpropellers

Claims

[1] Dishwasher (1), with - a rinsing chamber (3) for holding wash ware, - a spray device (6) for distributing rinsing water in the rinsing chamber (3), wherein the spray device (6) comprises a spray propeller (8) rotatably mounted about a rotation axis (7), - an electric motor drive (14) for rotating the spray propeller (8), - a pumping device for discharging the rinsing water, and - a heating device for heating the rinsing water, -- wherein the electric motor drive (14) is designed to drive the spray propeller (8) at variable speeds and / or with alternating directions of rotation, -- wherein the spray propeller (8) is designed as a single-armed device with respect to the rotation axis (7), -- wherein the rinsing chamber (3) is divided into different spray zones (16, 17, 18, 19) over a full revolution of the spray propeller (8) and / or can be subdivided according to user requirements, -- wherein each of the spray zones (16, 17, 18, 19) is assigned a function type and / or can be assigned to a specific user, and -- wherein the electric motor drive (14) is designed to drive the spray propeller (8) in each spray zone (16, 17, 18, 19) at a speed associated with the type of function of the respective spray zone (16, 17, 18, 19) during operation of the dishwasher (1), characterized bythat the pumping device is designed to discharge the rinsing water at a rinsing water pressure with a varying pressure value via nozzle openings (12) arranged in a spray arm (10) of the spray propeller (8) and / or that the heating device is designed to heat the rinsing water to a rinsing water temperature with a varying temperature value, wherein the electric motor drive (14) and / or the pumping device are designed to discharge the rinsing water by means of the spray propeller (8) only in a part of the spray zones (16, 17, 18, 19) which is reduced compared to the total number of spray zones (16, 17, 18, 19). [2] Dishwasher (1) according to claim 1, wherein the electric motor drive (14) is designed to drive the spray propeller (8) with alternating direction of rotation in at least one of the spray zones (16, 17, 18, 19) during operation of the dishwasher (1) depending on the type of function assigned to this spray zone (16, 17, 18, 19). [3] Dishwasher (1) according to claim 1 or 2, wherein an extension (24) provided with nozzle openings (12) for discharging rinsing water in corner regions (28) of the rinsing chamber (3) is pivotably arranged on a free end (22) of the spray propeller (8) remote from the rotation axis (7). [4] Dishwasher (1) according to claim 3, wherein the washing chamber (3) has a guide web (26) along which the extension (24) of the spray propeller (8) is guided for pivoting out and in on the spray propeller (8). [5] Dishwasher (1) according to one of claims 1 to 4, with a sensor device for determining a current rotational position of the spray propeller (8) with respect to the washing chamber (3). [6] Method for operating a dishwasher (1) designed according to one of claims 1 to 5, - wherein, according to the method, the single-armed spray propeller (8) is driven at variable speeds and / or with alternating directions of rotation for discharging rinsing water, - wherein the rinsing chamber (3) is divided into different spray zones (16, 17, 18, 19) in the direction of rotation of the spray propeller (8), - wherein each of the spray zones (16, 17, 18, 19) is assigned a function type, and - wherein the single-armed spray propeller (8) is driven in each spray zone (16, 17, 18, 19) at a speed associated with the type of function of the respective spray zone (16, 17, 18, 19) and / or with a different frequency of change of direction of rotation, characterized bythat the rinsing water is applied with a rinsing water pressure with a varying pressure value via the nozzle openings arranged in the spray arm and / or that the rinsing water is heated, wherein from a predetermined or user-specific adjustable threshold value for the rinsing water temperature of the rinsing water by means of the spray propeller (8) the rinsing water is applied only in a part of the spray zones (16, 17, 18, 19) which is reduced compared to the total number of spray zones (16, 17, 18, 19).

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